# Motor stator

## Definition

The motor stator is an important part of the motor such as generators and starters. The stator is an important part of the motor. The stator is composed of three parts: a stator core, a stator winding and a base. The main function of the stator is to generate a rotating magnetic field, and the main function of the rotor is to be cut by the lines of magnetic force in the rotating magnetic field to generate (output) current. my country's motor parts and accessories market is distributed in the southeast coast and the Yangtze River Delta.

## Structural classification

1. The stator winding forms the magnetic poles to distinguish

The stator winding forms the relationship between the actual number of magnetic poles according to the number of magnetic poles of the motor and the distribution of windings. Divided into two types, the dominant type and the general type.

1. Salient-pole winding

In salient-pole winding, each (group) coil forms a magnetic pole, and the coil (group) of the winding The number is equal to the number of magnetic poles.

In the salient-pole winding, in order to make the magnetic poles N and S separate from each other, the current direction in two adjacent coils (groups) must be opposite, that is, the two adjacent coils (groups) ) Must be connected to the tail end and the head end to the head end (electrical terminology is "tail to tail, head joint"), that is, reverse connection in series.

2. Unipolar winding

In the unipolar winding, each (group) coil forms two magnetic poles, and the coil (group) of the winding The number of) is half of the number of magnetic poles, because the other half of the magnetic poles are formed by the magnetic field lines of the magnetic poles generated by the coil (group).

In the single-pole winding, the polarity of the magnetic pole formed by each coil (group) is the same, so the current direction in all coils (group) is the same, that is, two adjacent coils ( The connection mode of the group) should be the tail end connected to the head end (in the electrician terminology "tail joint"), that is, the serial connection mode.

Two. Differentiate between the shape of the stator winding and the embedded wiring method

The stator winding is different according to the shape of the coil winding and the embedded wiring method. Divided into two types: centralized and distributed.

1. Concentrated windings

Concentrated windings generally consist of only one or several rectangular frame coils. After winding, it is wrapped with gauze and shaped, and then embedded in the iron core of the salient magnetic pole after being dipped and dried. The excitation coils of DC motors, general-purpose motors, and the main pole windings of single-phase shaded pole motors all use this type of winding.

2. Distributed winding

The stator of the motor adopting distributed winding has no convex pole palms, and each magnetic pole consists of one or several The coil is embedded and wired according to a certain rule to form a coil group. According to the different forms of embedded wiring arrangement, distributed windings can be divided into two types: concentric and stacked.

(1) Concentric windings Concentric windings are several rectangular coils of different sizes in the same coil group, which are embedded and arranged one by one according to the same center position into a back shape. Concentric windings are divided into single layer and multilayer. Generally, the stator windings of single-phase motors and some low-power three-phase asynchronous motors adopt this type.

(2) Stacked windings Stacked windings are all coils of exactly the same shape and size (except for single and double turns). Each slot is embedded with a coil side, and the outer ends of the slot are stacked one by one Evenly distributed type. Stacked windings are divided into single-layer stacking and double-layer stacking. Only one coil side embedded in each slot is a single-layer stacked winding, or called a single-stack winding; each slot with two coil edges (upper and lower) that belong to different coil groups is a double-layer stacked winding, or called a double Stack winding. Stacked windings are divided into single and double-turn cross wiring arrangements and single- and double-layer mixed wiring arrangements due to different changes in the embedded wiring method; in addition, the embedded shape from the winding end is called chain winding and basket winding. In fact, they are all stacked windings. Generally, the stator windings of three-phase asynchronous motors use stacked windings.

## Type

According to the type of production process, it can be divided into: winding stator, three-piece stator, and full-piece stator

According to the working type of the motor: synchronous motor stator, Asynchronous motor stator

According to the motor type: generator stator, starter stator

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